A boy of 14 has been charged with raping his mother, police have said.The youngster is alleged to have committed the attack at the family home in Blackpool, Lancashire, last weekend.Judge Jeff Brailsford, sitting at the town’s magistrates’ court, called the alleged offence a ‘grave crime’, the Blackpool Gazette reports.The boy, who cannot be named for legal reasons, was released on bail ahead of a hearing at Preston crown court on March 11.He is said to be the youngest in Britain to be charged with the rape of a mother.